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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59414d91075e6190c13cd7c78e611eecda7d7e8042a44ff303e942c8c16202da' 
  AND token = 'F6hgztKYVRcIg9m2euaEAaxSSJO7bNZ2lp4OANIVQdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}